package com.example.demo.base;

import java.util.HashSet;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * 安全的容器
 */
public class ContainerNotSafeDemo {

    public static void main(String[] args) {
        Set<String> set = new CopyOnWriteArraySet<>( );
        for (int i = 0; i < 30; i++) {
            new Thread(() -> {
                set.add(UUID.randomUUID().toString().substring(0, 8));
                System.out.println(set);
            },String.valueOf(i)).start();
        }
        System.out.println(set);
    }


}
